105 lines
3.4 KiB
JavaScript
105 lines
3.4 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $parseInt = GetIntrinsic('%parseInt%');
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var inspect = require('object-inspect');
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var regexTester = require('../helpers/regexTester');
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var callBound = require('call-bind/callBound');
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var every = require('../helpers/every');
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var isDigit = regexTester(/^[0-9]$/);
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var $charAt = callBound('String.prototype.charAt');
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var $strSlice = callBound('String.prototype.slice');
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var IsArray = require('./IsArray');
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var IsInteger = require('./IsInteger');
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var Type = require('./Type');
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var canDistinguishSparseFromUndefined = 0 in [undefined]; // IE 6 - 8 have a bug where this returns false
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var isStringOrHole = function (capture, index, arr) {
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return Type(capture) === 'String' || (canDistinguishSparseFromUndefined ? !(index in arr) : Type(capture) === 'Undefined');
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};
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// https://ecma-international.org/ecma-262/6.0/#sec-getsubstitution
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// eslint-disable-next-line max-statements, max-params, max-lines-per-function
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module.exports = function GetSubstitution(matched, str, position, captures, replacement) {
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if (Type(matched) !== 'String') {
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throw new $TypeError('Assertion failed: `matched` must be a String');
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}
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var matchLength = matched.length;
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if (Type(str) !== 'String') {
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throw new $TypeError('Assertion failed: `str` must be a String');
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}
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var stringLength = str.length;
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if (!IsInteger(position) || position < 0 || position > stringLength) {
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throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, and less than or equal to the length of `string`, got ' + inspect(position));
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}
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if (!IsArray(captures) || !every(captures, isStringOrHole)) {
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throw new $TypeError('Assertion failed: `captures` must be a List of Strings, got ' + inspect(captures));
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}
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if (Type(replacement) !== 'String') {
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throw new $TypeError('Assertion failed: `replacement` must be a String');
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}
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var tailPos = position + matchLength;
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var m = captures.length;
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var result = '';
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for (var i = 0; i < replacement.length; i += 1) {
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// if this is a $, and it's not the end of the replacement
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var current = $charAt(replacement, i);
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var isLast = (i + 1) >= replacement.length;
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var nextIsLast = (i + 2) >= replacement.length;
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if (current === '$' && !isLast) {
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var next = $charAt(replacement, i + 1);
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if (next === '$') {
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result += '$';
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i += 1;
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} else if (next === '&') {
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result += matched;
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i += 1;
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} else if (next === '`') {
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result += position === 0 ? '' : $strSlice(str, 0, position - 1);
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i += 1;
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} else if (next === "'") {
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result += tailPos >= stringLength ? '' : $strSlice(str, tailPos);
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i += 1;
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} else {
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var nextNext = nextIsLast ? null : $charAt(replacement, i + 2);
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if (isDigit(next) && next !== '0' && (nextIsLast || !isDigit(nextNext))) {
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// $1 through $9, and not followed by a digit
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var n = $parseInt(next, 10);
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// if (n > m, impl-defined)
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result += n <= m && Type(captures[n - 1]) === 'Undefined' ? '' : captures[n - 1];
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i += 1;
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} else if (isDigit(next) && (nextIsLast || isDigit(nextNext))) {
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// $00 through $99
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var nn = next + nextNext;
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var nnI = $parseInt(nn, 10) - 1;
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// if nn === '00' or nn > m, impl-defined
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result += nn <= m && Type(captures[nnI]) === 'Undefined' ? '' : captures[nnI];
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i += 2;
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} else {
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result += '$';
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}
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}
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} else {
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// the final $, or else not a $
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result += $charAt(replacement, i);
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}
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}
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return result;
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};
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